Siemens 3RV1011-1EA15 Specs: 2.8–4A Motor Protection Circuit Breaker Guide

The Siemens 3RV1011-1EA15 is a SIRIUS 3RV1 motor protection circuit breaker designed for three-phase motor circuits with an adjustable overload release range of 2.8–4 A. It features Class 10 thermal protection, a 52 A instantaneous short-circuit release, three main poles, and an integrated transverse auxiliary contact with 1 NO + 1 NC contacts. Its S00 frame, screw terminals, and compatibility with appropriately rated S00 contactors make it suitable for compact industrial motor starter assemblies.

Siemens 3RV1011-1EA15 Technical Specifications

The 3RV1011-1EA15 combines thermal overload protection and magnetic short-circuit protection in one manually operated device. Its specifications are particularly relevant when maintaining older Siemens SIRIUS motor starter installations.

Source: Siemens official 3RV1011-1EA15 technical datasheet. Always check the current manufacturer’s documentation for electrical ratings and installation conditions.

How Does the 2.8–4A Motor Protection Range Work?

The adjustable thermal release protects the motor against sustained overcurrent. The 3RV1011-1EA15 provides a setting range of 2.8–4 A, allowing engineers to match the protection setting to the motor’s rated current.

For example, a motor with a nameplate current of 3.5 A falls within this adjustment range. The appropriate setting should be determined from the motor nameplate and applicable protection requirements rather than selected solely according to the motor’s nominal power.

A motor rated at 2 A falls below the available adjustment range, while a motor rated at 4.5 A exceeds it. Neither application should be forced into this model’s specified range.

Motor current also changes with supply voltage, efficiency, power factor, and operating conditions. For this reason, engineers should use actual nameplate current as the primary selection reference.

What Does the 52A Short-Circuit Release Mean?

The 52 A value represents the instantaneous magnetic short-circuit release threshold. It is separate from the adjustable thermal overload setting.

The two protection mechanisms serve different purposes:

• Thermal overload release: Responds to sustained excessive current that may cause motor overheating.
• Magnetic short-circuit release: Responds rapidly to high fault currents to interrupt the circuit.

Importantly, 52 A is not the breaker’s short-circuit breaking capacity. The published 100 kA breaking capacity at 400 V AC refers to a separate short-circuit performance rating under specified test conditions.

Before installation, engineers must compare the applicable breaking capacity with the prospective fault current at the installation point. Upstream protection and coordination requirements must also be evaluated.

Class 10 Protection and Phase-Failure Detection

The Class 10 characteristic describes the thermal overload trip behavior under defined test conditions. It is relevant to motor applications because starting current can temporarily exceed normal operating current.

Class 10 does not mean the breaker always trips after exactly ten seconds. Actual tripping behavior depends on current magnitude, duration, initial thermal condition, and the manufacturer’s time-current characteristics.

The 3RV1011-1EA15 also supports phase-failure-sensitive protection. In three-phase motor systems, losing one phase can produce unbalanced current and overheating in the remaining phases.

This protection function is particularly relevant to pumps, fans, and small production motors that may otherwise continue operating under abnormal phase conditions.

Applications in Industrial Motor Starter Systems

The 3RV1011-1EA15 is intended for motor circuits whose electrical requirements match its 2.8–4 A adjustment range.

• Small pump motors: Protection in suitable water handling and process applications.
• Ventilation systems: Motor protection for appropriately rated fans.
• Compact conveyors: Protection for small material-handling motors.
• Manufacturing equipment: Motor circuit protection for auxiliary machinery and production equipment.

In a typical motor starter, the breaker can be combined with a suitably selected contactor. The breaker handles motor overload and short-circuit protection, while the contactor performs routine switching.

For related Siemens switching equipment, see the Siemens 3RT6015-1AN21 power contactor. This is a related SIRIUS component, not an automatically approved combination. The correct pairing must be checked against Siemens coordination documentation and the actual motor application.

3RV1011-1EA15 Replacement: What Should Engineers Check?

The 3RV1011-1EA15 belongs to the older SIRIUS 3RV1 generation. When maintaining an existing installation, replacing it with a newer breaker requires more than matching the 2.8–4 A current range.

Check the following before selecting a replacement:

1. Motor current: Confirm that the required overload setting remains within the appropriate range.
2. Short-circuit performance: Compare the required breaking capacity at the actual system voltage.
3. Trip characteristics: Check Class 10 requirements and motor starting conditions.
4. Auxiliary contacts: Verify the 1 NO + 1 NC arrangement and transverse mounting.
5. Physical dimensions: Compare the S00 frame, mounting position, and available panel space.
6. Contactor coordination: Confirm the approved breaker-contactor combination if the installation uses a motor starter assembly.

Newer Siemens SIRIUS 3RV2 devices may offer comparable current ranges, but this does not automatically establish direct replacement compatibility. Terminal arrangements, dimensions, accessories, short-circuit ratings, and coordination tables must all be checked.

For industrial automation spare parts, the Siesource industrial automation product catalogue provides access to related components. When requesting a quotation, include the complete part number, motor nameplate information, required quantity, and existing starter configuration. You can submit these details through the Siesource contact page.

Frequently Asked Questions

What is the current adjustment range of Siemens 3RV1011-1EA15?

The adjustable thermal overload release range is 2.8–4 A. The setting should be selected according to the motor nameplate and applicable protection requirements.

What is the instantaneous short-circuit release of this model?

The specified instantaneous magnetic release threshold is 52 A. This is different from the breaker’s rated short-circuit breaking capacity.

What does Class 10 mean on the 3RV1011-1EA15?

Class 10 describes the overload trip characteristic under specified test conditions. Actual trip time depends on current magnitude, duration, and the thermal state of the device.

Does the 3RV1011-1EA15 include auxiliary contacts?

Yes. This version includes a transverse auxiliary contact arrangement with one normally open and one normally closed contact.

Can a newer 3RV2 breaker directly replace the 3RV1011-1EA15?

Not automatically. Engineers must verify current range, electrical ratings, mounting dimensions, auxiliary contact configuration, and approved motor starter coordination before replacement.

Conclusion

The Siemens 3RV1011-1EA15 is a SIRIUS 3RV1 motor protection circuit breaker with a 2.8–4 A adjustable overload range, a 52 A instantaneous magnetic release, and Class 10 protection. Its S00 frame, screw terminals, and integrated 1 NO + 1 NC auxiliary contacts make it relevant to compact industrial motor starter installations. For replacement projects, the complete electrical and mechanical configuration should be checked rather than relying on current-range similarity alone.